This is the beautiful moment two sisters beam with delight as they are given a surprise reunion with their baby brother who had just undergone brain surgery. Kenzo Iwazaki Hirata, aged three, who has Down syndrome, suffered a stroke at the end of last year which doctors discovered was caused by a condition called Moyamoya. Moyamoya – meaning “puff of smoke” in Japanese – is a rare, progressive cerebrovascular disorder caused by blocked arteries at the base of the brain. As a result, Kenzo needed revascularization surgery, which required his mom Renata and dad, Rafael, to travel more than 600 miles from their home in Toledo, Brazil, to Sao Paolo. During Kenzo's surgery, his sisters – Ayumi, 11, and Yuna, seven – were extremely nervous, and during the seven-hour surgery they couldn't wait to see their brother again. Having been given the news Kenzo's surgery was a success, they were then told he would be taken to the intensive care unit, which meant Ayumi and Yuna still could not visit their brother. But as the siblings continued to anxiously wait, Rafael was told the news that he could visit his son – and so he and Renata decided to plan a surprise for the girls, too.